Pg. 64; Frye and others, 1969, Illinois Geol. Survey Circ., no. 437. Capron Till Member of Winnebago Formation. Previously called informal Capron till by Frye and others (1969). Is pinkish gray to reddish brown till, 6.5 feet thick. Separated into an upper sandy phase, 3 feet thick, and lower silty phase, 3.5 feet thick. Top foot is leached. Clay in upper phase mostly explandable clay; in lower phase mostly illite. Occurs in northern Illinois and extends into southern Wisconsin. Overlies Plano Silt Member of Winnebago Formation; underlies Robein Silt (new) or Peoria Loess. Age is Pleistocene (Wisconsinan; Altonian). Radiocarbon age determinations from sediments above and below the Capron indicate it is latest Altonian (pre-Farmdale).
Type section: Capron North section, in roadcut 3 mi north of Capron, in NE/4 SE/4 SE/4 sec. 23, T. 46 N., R. 4 E., [approx. Lat. 42 deg. 26 min. 44 sec. N., Long. 88 deg. 43 min. 34 sec. W., Capron 7.5-min quadrangle], Boone Co., central northern IL.
Named from village of Capron, Boone Co., central northern IL, where well-exposed in prominent north-south trending ridge through town.
[Additional locality information from USGS historical topographic map collection TopoView, accessed on June 9, 2018.]

Source: Publication; US geologic names lexicon (USGS Bull. 1520, p. 51-52).

Pg. 4 (table 1); App., p. A6-2 to A6-4. Capron Member of Zenda Formation. Willman and Frye's (1970) Capron Till Member of Winnebago Formation, of central northern Illinois, is extended into southern Wisconsin as the lower member of Zenda Formation (new). Consists of pinkish-brown till. Exposed locally in southwestern Walworth County, Wisconsin. Lies below Tiskilwa Member of Zenda Formation [=Tiskilwa Till Member of Winnebago Formation in Illinois] and above Clinton Member of Walworth Formation; nature of lower and upper contacts not yet determined. Till of the Capron distinguished from tills of the Clinton and younger Horicon Formation by its finer texture and slightly darker or pinker color. Is lithologically similar to till of Tiskilwa but is usually less red in color. Age is Pleistocene (Wisconsinan).
Reference section: in borrow pit, in SE/4 SW/4 SE/4 sec. 5, T. 1 N., R. 15 E., [approx. Lat. 42 deg. 33 min. 54 sec. N., Long. 88 deg. 44 min. 36 sec. W.], Sharon 7.5-min quadrangle, Walworth Co., southeastern WI.
[Additional locality information from Syverson and others, 2011, Wisconsin lexicon of Pleistocene units, Wisconsin Geol. Nat. Hist. Survey Tech. Rpt., no. 1; supplemented from USGS historical topographic map collection TopoView, accessed on June 9, 2018.]

Source: Publication

[Not synopsized to date. Lithology, thickness, distinguishing characteristics, contacts, sections, areal extent, age, correlations discussed.]
Pg. 4 (fig. 2), 7 (fig. 3), 8, 53-54. Capron Member of Zenda Formation.

Source: NA